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- W2019973610 abstract "Tongue keratinocytes have high S-phase and mitotic indices with evident circadian variation. Transplanted tumors modify the intensity and temporal structure of the S-phase index in cell populations in tumor-bearing animals; also, partial hepatectomy changes the concentrations of substances involved in cellular proliferation, leading to compensatory liver hyperplasia. The aim of our study was to analyze the interaction between tumor growth and the liver regeneration that follows partial hepatectomy, and the effects of both these processes on lingual keratinocytes. We used 380 adult male mice divided into six groups: tumor-free and tumor-bearing mice without surgery, with sham hepatectomy, and with partial hepatectomy. Each group was divided into six subgroups, which were killed at 4-h intervals until a circadian cycle was completed (from 26 until 50h post-surgery in the operated animals). Each animal was injected with 5-bromodeoxyuridine (50mg/kg) 1h before it was killed, and tongue samples were obtained and processed for histology. The sections were placed on silanized slides and incubated with the primary antibody Bu 20a (1/100 dilution). The reaction was developed using diaminobenzidine and staining was detected visually. SIs were measured as the number of labeled nuclei per thousand cells. The mean+/-S.E. of each group was calculated. Differences among experimental groups were analyzed by ANOVA and the Student-Newman-Keuls Multiple Comparisons Test. The results show that the presence of a tumor alters the normal circadian curve of SI in lingual keratinocytes, irrespective of whether the mice underwent surgery. This finding has to be considered in drug treatments for neoplasms and in experiments related to growth." @default.
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- W2019973610 date "2006-11-01" @default.
- W2019973610 modified "2023-09-25" @default.
- W2019973610 title "DNA synthesis in tongue keratinocytes of hepatectomized and tumor-bearing mice" @default.
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- W2019973610 doi "https://doi.org/10.1016/j.cellbi.2006.06.013" @default.
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